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In this episode, we break down peptides. What they are, how they work in the body, and which categories are most relevant in modern medicine.
We cover GLP-1s, growth hormone-releasing peptides, healing peptides like BPC-157 and TB-500, skin and cosmetic peptides, and immune-modulating peptides, along with the safety questions every patient should ask before starting one.
For each category, we cover the proposed mechanism, the available human data, what is FDA approved and what is not, the theoretical risks worth understanding, and the patient profiles most likely to benefit. We also walk through the critical safety questions every patient should ask before starting sourcing peptides, third-party testing, certificates of analysis, compounding pharmacy regulation, and the meaningful differences between compounded medications, investigational compounds, and research chemicals.
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This episode is meant to do what social media cannot: give you the framework to make a thoughtful, informed decision about whether peptides belong in your protocol, and how to use them safely if they do.
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FAQs
How are peptides administered?
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Because peptides break down quickly in the digestive tract, most are administered by subcutaneous injection or nasal spray rather than oral capsules. Some skin and cosmetic peptides are applied topically.
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Are peptides safe?
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Reputable, properly sourced peptides used under appropriate clinical oversight are generally well-tolerated. Safety depends heavily on sourcing, purity, dosing, and patient selection. Peptides sourced from unregulated online vendors marketed "for research use only" are not safe for human use, regardless of how they are framed.
What is the difference between compounded peptides and research chemicals?
Compounded peptides are prepared by licensed compounding pharmacies under USP standards and state or FDA regulatory oversight, with traceable sourcing and certificates of analysis. Research chemicals are sold by unregulated online vendors without medical oversight, third-party testing, or quality assurance, and are not intended for human use.
Do peptides help with aging or longevity?
The category of "longevity peptides" is one of the most speculative areas of peptide therapy. Several peptides have promising mechanisms, but human data is insufficient to make confident long-term claims. The honest position is that we do not yet know enough to recommend them broadly for this purpose.
Do peptides cause cancer?
Most peptides do not. However, peptides that promote growth, including growth hormone-releasing peptides and some healing peptides, carry a theoretical concern in patients with active or recent cancer or significant familial cancer risk. Patient selection and clinical monitoring are important in this context.
Can I take peptides as a pill?
Most peptides cannot be taken orally because they are broken down by digestive enzymes before they can be absorbed. The exceptions are limited. Most clinically relevant peptides are administered by injection, nasal spray, or topical application.
Should I monitor anything while on peptide therapy?
Yes. Monitoring depends on the peptide. Patients on GLP-1 therapy may have metabolic markers and weight tracked. Patients on growth hormone-releasing peptides may have IGF-1 levels checked. Patients on GHK-Cu should have copper and zinc levels monitored. Monitoring should be tailored to the peptide and the patient and overseen by a qualified clinician.
Do peptides replace lifestyle changes?
No. Peptides amplify the systems they interact with but do not replace the lifestyle foundation those systems depend on. They work best as part of a broader plan that includes nutrition, movement, sleep, stress management, and appropriate medical care.
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References
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Fosgerau K, Hoffmann T. Peptide therapeutics: current status and future directions. Drug Discovery Today. 2015.
Lee AC et al. Peptide therapeutics: progress and challenges. Drug Discovery Today. 2019.
Wilding JPH et al. Once-weekly semaglutide in adults with overweight or obesity. NEJM. 2021.
DOI: 10.1056/NEJMoa2032183
Sikiric P et al. Stable gastric pentadecapeptide BPC-157. Current Pharmaceutical Design. 2018.
Lau JL, Dunn MK. Therapeutic peptides: historical perspectives. Bioorganic & Medicinal Chemistry. 2018.
DOI: 10.1016/j.bmc.2017.06.05
Chapters
00:00 Intro
00:06 Introduction to Peptides
00:38 Understanding Peptides: Basics and Functions
01:58 Peptides in Medicine: Applications and Limitations
02:50 Categories of Peptides: Metabolic and Growth Hormone
05:07 Healing and Regeneration Peptides
07:04 Cosmetic and Skin Peptides
08:24 Immune Modulating Peptides
08:49 Safety and Regulation of Peptides
11:14 Conclusion: Making Informed Decisions about Peptides
12:46 Outro